Driving while impaired (DWI). In North Carolina, it is illegal to drive a vehicle while under the influence of an impairing substance or after consuming alcohol with an alcohol concentration of 0.08 or higher. There are six (6) levels of sentencing for a DWI conviction and each level carry a different penalty and fine. Therefore, it is important for you to call us right way to see which level of DWI you may fall in if you are convicted.